Also it depends on whose gut the feeling belongs to. To mine it doesn't sound so preposterous that an object falling from space at a huge velocities can cause e

Also it depends on whose gut the feeling belongs to. To mine it doesn't sound so preposterous that an object falling from space at a huge velocities can cause ejecta which also flies up at huge velocities. Surely doing the math is the key for a proper answer but having a gut feeling can be a useful first order guide on a subject, as long as one remains open to further argumentation to further refine one's intuition.